And when they heard it, they glorified the Lord, and said unto him, Thou seest, brother, how many thousands of Jews there are which believe; and they are all zealous of the law: How many thousands - Ποσαι μυριαδες; How many myriads, how many times 10,000. This intimates that there had been a most extraordinary and rapid work even among the Jews; but what is here spoken is not to be confined to the Jews of Jerusalem, but to all that had come from different parts of the land to be present at this pentecost.
They are all zealous of the law - The Jewish economy was not yet destroyed; nor had God as yet signified that the whole of its observances were done away. He continued to tolerate that dispensation, which was to be in a certain measure in force till the destruction of Jerusalem; and from that period it was impossible for them to observe their own ritual. Thus God abolished the Mosaic dispensation, by rendering, in the course of his providence, the observance of it impossible.